Did not make the intention that night to fast the following day

After a man had gone to sleep [one night], the sighting of the moon for the start of Ramadhaan was [officially] announced; [This being the case] he had not made the intention that night to fast [the following day] and [as such] he woke up in the morning and did not fast [that day] since he was unaware of the [official announcement of the] sighting of the moon. So what is obligatory upon him now?